Two-cycle gas engine



15, 1929. HACKMAN 1,732,013

TWO-CYCLE GAS ENGINE Filed Dec. 2, 1926 i 3 5% 3 I 9'8 54 Q v a. a? & r an 50 5a 5 1 54 D1 25 53 ab n6 is 4 a? I N VEN TOR. Hdfr flaw/v man ATTORNEY.

Patented Oct. 15, 1929 i j HARRY HACKMAN, 013 DETROIT, MICHIGAN TWO-CYCLE GAS ENGINE Applicaticnfiled; .December 2, 1926. Serial No. 152,084.

My invention relates to a new and useful valve 15 is moved from its seat, a suitable improvement in a two cycle gas engine, and conduit 16 being provided for carrying the has for its object the provision of a gas enexhausted gases away. The head proper 17 gine which will be highly eliicient in operais provided with a cylinder 18 in which is tion, and in which the lost motion of the gas slidably mounted the piston 19 having the 5 engine may be reduced to a minimum. sealing rings 20 formed thereon. A cover Another object of the invention is the pro- 21 is positioned above the cylinder 18, and vision of a two cycle gas engine which will projected through this cover 21 is the piston be simple in structure and. durable in use. rod 22 which connects to the piston 19. Em-

Another object of the invention is the pro bracing thepiston rod 22 and engaging at so vision in a gas engine of this type of a comone end the cover 21 is a coil spring 23, the pressing cylinder and provided with mechaniother end engaging a washer 23 on the piston cal means for operating said compressing cylrod 522. Projecting from the upper end of inder at predetermined positions of operation the piston rod 22 are lugs 24 and 25, between of the engine. which is rotatably mounted a roller 26. Pro- Another object of the invention is the projecting upwardly from the cover 21 are supvision of a control valve for controlling the porting standards 27 and 28, these supportinlet of the compressed gases into the coming starulards being provided with bifurcabustion chamber, so that the same may be detions or supporting arms 29 and 30 and serv- 2 livered to the combustion chamber in predeing to support the cam shaft 31. Mounted termined degrees of compression at predeupon the cam sh aft 31 is a cam 32 adapted to termined intervals. engage a roller 33 mounted on one end of the Other objects will appear hereinafter. lever which is rockingly supported on the The invention consists in the combination arm 30. The opposite end of the lever 33 is 25 and arrangement of parts hereinafter desconnected to the valve stem 34- whieh projects cribed and claimed. through the guide 35 and carries the valve The invention will be best understood by a 15. Aspring36 is mounted on the valve stem reference to the accompanying drawings 34. d engages a; 0119 d a pr j ctio 36', which form a part of this specification and in nd t th th d a washer 36 which is 30 which a y mounted on the valve stem 34, so as to normalso Fig. 1 is a fragmentary sectional view of ly retain the valve 15 in closing position. I an engine embodying the invention taken on Rockingly mounted on the arm 29 is a lever substantially line 11 of Fig. 2. 38, one end of which is provided with a roller Fig. 2 is a sectional. vlew of the invent 38' adapted to engage the cam 37 which is 35 taken on substantially line 22 of Fig. 1- fixedly mounted upon the cam shaft 81. The

Fig. 3 is a top plan View Of the invent n. opposite end of the lever 38 is connected to the The invention may be mounted 1 1 h valve stem 39 which passes through the guide standard type of gasoline engine, the ea l-(land carries the piston 11 which is slidably being separable from the cylinder block. In mounted in the pocket 11. Mounted on the the drawings I have illustrated an internal stem 39 is the valve head 42. A spring 43 is so combustion engine embodying the principles t d on th Valvg t 39 i b i g Of my iIlVClltlOIl in Which there is a cylinder relation and erves to no nally retain the 7, a crank case 8 and a crank shaft 9, the crank valve head l2 in engagement With its Seat. A shaft being connected by the connecting rod manifold 1 is provided for delivering the 45 10 to the Wrist pin 11 which is attached to the ga t th i t i r f th cylind r 18, this [)5 piston 12 which is reciprocally mounted in the manifold communicating through the opencylinder 7. Positioned above thecylinder 7 ing 15 and the passage 16 with the interior is a head 13 forming with the upper surface of the cylinder 18. Projecting from the cover of the cylinder block a passage let whereby 21 and through the guide 17 is a valve stem ii the exhaust gases maybe discharged when the 1418 which connected at its up}; 41. end to one end of the rockingly mounted lever 49 carried by the standard 27, the other end of which is provided Wih the roller 50 engaging the cam 51 which ismounted upon the cam shaft 31. A valve head 52 is carried by the stem 4.8 so as to open and close communication between the passage t5 and the passage 46, a spring 53 serving normally to retain this valve in closed position. Fixedly mounted on the cam shaft 31 is a large cam 54 adapted, upon rotation of the cam shaft 31, to engage the roller 26, and move the cylinder 18 downwardly in the piston 19. a

The crank shaft 9 is'provided with a bevel gear 55, 1neshing with a bevel gear 56 mounted fixedly on the shaft 5-1, this shaft carrying the bevel gear 58 meshing with the bevel gear 59 fixedly, mounted on the cam shaft 31.

In operatiomwhen the crank shaft is rotated the cam shaft will be rotated also through the operation of the bevel gears. 'The'arrangement. of the cams is such that as the piston 12 moves upwardly in the cylinder T the exhaust port will be open by the valve -15 being moved from its seat through the engagement ofthe cam 32 with the roller 33.

, As the cylinder moves to a position closely approaching its limit of upward movement so that scavenging of the exhaust gases shall have been quite complete, the valve 15 moves to itsclosed position in response to thetension of the spring 36. At the same time, the valve 52 opens to admit gas to the cylinder 18. Succeeding this movement, the valve 52 moves to closed position, and the cam 54: engages the roller 26. to move the cylinder 19 downwardly. As this cylinder'moves clown- Wardly closely approaching the lowermost position of its movement, the valve. 4-2

through the operation of the lever 38 and the cam 37 willopen to admit the gas which is compressed into the combustion chamber, the

piston 41 being provided to prevent leakage of thegases around the valve stem 39 when the gases are under-compressed condition.

--Then thismovement has been completed, the

valve 42'again moves'to closed position, after whiclrthe firing by means of the spark plug 60 novelmethod of admitting the gases into the takes place. The operation is then completed. It. will be noted that I have provided a combustion chamber, employing with the combustion chamber a compression chamber which is the cylinder 18 and that the admission of the gases from the compression chamber to the combustion chamber are also controlled to permit this admission at periodic -times.1

v The invention constructed in this manner isone whlch provides a highly efiicient internal combustion engine, and at the same time,

-one which is easily and cheaply manufactured,-so arranged as to be practically operatlve at all times, with a minimum: amount of repair.

While I have illustrated and described the preferred form of construction, I do not wish to limit myself to the precise form of structure shown, but desire to avail myself of such variations and modifications as may come within the scope of the appended claims.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A device of the class described comprising: a cylinder bearing head; a piston slidably mounted in said head; resilient means exterior of said head for normally retaining said piston at one position; a cam for moving said piston from said position; said h ad having an outlet port formed therein a valve for closing said outlet port; resilient means for normally retaining said valve in closed position; a cam for opening said valve, said cam being operable at predetermined positions of movement of said piston; said head having an inlet port formed therein; a valve for closing said inlet port; resilient means for normally retaining said valve in closed position; a cam for opening said valve, said cam being operable at predetermined positions of said piston; said head having an exhaust port formed therein; a valve for closin said exhaust port; resilient means for normally retaining said valve in closed. position and cam operated means for opening said valve at predetermined positions of said piston.

2. In a two cycle gas engine of the class described, having a cylinder and a crank shaft, and provided with a piston in said cylinder reciprocated through connections with saidv crank shaft; a head'mounted over said cylinder; a cylinder formed in said head; a piston slidably mounted in said head cylinder; an intake manifold communicating with a passage in said head, said passage connnunicating with said head cylinder; a control valve for controlling communication of said passage with said head cylinder, said head cylinder having an outlet opening adapted for communication with the cylinder of said engine; a control valve for controlling communication of said head cylinder with said engine cylinder; a cam shaft mechanism driven piston in said head cylinder elevated therein.

3. In a two cycle gas engine of the class described: a cylinder; a crank shaft; a piston slidably mounted insaid cylinder and connected to said crank shaft; a head mounted over said cylinder; a cylinder formed in said head in axial alignment with said first mentioned cylinder; a piston slidably mounted in said head cylinder; an intake manifold communicating with a passage in said head, said passage communicating with said head cylinder; a control valve for controlling communication of said passage with said head cylinder, said head cylinder having a lateral outlet opening formed adjacent its base for communicating with said first mentioned 10 cylinder; and a control valve for controlling communication of said head cylinder with said first mentioned cylinder.

In a two cycle gas engine of the class described: a cylinder; a crank shaft; a pis- 15 ton slidably mounted in said cylinder and connected to said crank shaft; a head mounted over said cylinder; a cylinder formed in said head in axial alignment with said first mentioned cylinder; a piston slidably mount- 29 ed in said head cylinder; an intake manifold communicating with a passage in said head, said passage communicating with said head cylinder; a control valve for controlling communication of said passage with said head cylinder, said head cylinder having a lateral outlet opening formed adjacent its base for communicating with said first mentioned cylinder; a control valve for, controlling communication of said head cylinder with said first 3o mentioned cylinder; a rod on said last named control valve projecting outwardly through said head; and a piston carried by said rod and slidable in a recess formed in said head.

5. In a two cycle gas engine of the class described: a cylinder; a head mounted on said cylinder; a cylinder formed in said head in axial alignment with said first mentioned cylinder and communicating therewith through a lateral opening formed in its base, the base of said head cylinder forming the upper end and serving as a closure for said first mentioned cylinder; and a control valve for controlling communication of said cylinders.

In testimony whereof I have signed the 45 foregoing specification.

HARRY HACKMAN. 

